Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0
2 :
3 : #ifndef _LINUX_KERNEL_TRACE_H
4 : #define _LINUX_KERNEL_TRACE_H
5 :
6 : #include <linux/fs.h>
7 : #include <linux/atomic.h>
8 : #include <linux/sched.h>
9 : #include <linux/clocksource.h>
10 : #include <linux/ring_buffer.h>
11 : #include <linux/mmiotrace.h>
12 : #include <linux/tracepoint.h>
13 : #include <linux/ftrace.h>
14 : #include <linux/trace.h>
15 : #include <linux/hw_breakpoint.h>
16 : #include <linux/trace_seq.h>
17 : #include <linux/trace_events.h>
18 : #include <linux/compiler.h>
19 : #include <linux/glob.h>
20 : #include <linux/irq_work.h>
21 : #include <linux/workqueue.h>
22 : #include <linux/ctype.h>
23 :
24 : #ifdef CONFIG_FTRACE_SYSCALLS
25 : #include <asm/unistd.h> /* For NR_SYSCALLS */
26 : #include <asm/syscall.h> /* some archs define it here */
27 : #endif
28 :
29 : enum trace_type {
30 : __TRACE_FIRST_TYPE = 0,
31 :
32 : TRACE_FN,
33 : TRACE_CTX,
34 : TRACE_WAKE,
35 : TRACE_STACK,
36 : TRACE_PRINT,
37 : TRACE_BPRINT,
38 : TRACE_MMIO_RW,
39 : TRACE_MMIO_MAP,
40 : TRACE_BRANCH,
41 : TRACE_GRAPH_RET,
42 : TRACE_GRAPH_ENT,
43 : TRACE_USER_STACK,
44 : TRACE_BLK,
45 : TRACE_BPUTS,
46 : TRACE_HWLAT,
47 : TRACE_RAW_DATA,
48 :
49 : __TRACE_LAST_TYPE,
50 : };
51 :
52 :
53 : #undef __field
54 : #define __field(type, item) type item;
55 :
56 : #undef __field_fn
57 : #define __field_fn(type, item) type item;
58 :
59 : #undef __field_struct
60 : #define __field_struct(type, item) __field(type, item)
61 :
62 : #undef __field_desc
63 : #define __field_desc(type, container, item)
64 :
65 : #undef __field_packed
66 : #define __field_packed(type, container, item)
67 :
68 : #undef __array
69 : #define __array(type, item, size) type item[size];
70 :
71 : #undef __array_desc
72 : #define __array_desc(type, container, item, size)
73 :
74 : #undef __dynamic_array
75 : #define __dynamic_array(type, item) type item[];
76 :
77 : #undef F_STRUCT
78 : #define F_STRUCT(args...) args
79 :
80 : #undef FTRACE_ENTRY
81 : #define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
82 : struct struct_name { \
83 : struct trace_entry ent; \
84 : tstruct \
85 : }
86 :
87 : #undef FTRACE_ENTRY_DUP
88 : #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk)
89 :
90 : #undef FTRACE_ENTRY_REG
91 : #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \
92 : FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print))
93 :
94 : #undef FTRACE_ENTRY_PACKED
95 : #define FTRACE_ENTRY_PACKED(name, struct_name, id, tstruct, print) \
96 : FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print)) __packed
97 :
98 : #include "trace_entries.h"
99 :
100 : /* Use this for memory failure errors */
101 : #define MEM_FAIL(condition, fmt, ...) ({ \
102 : static bool __section(".data.once") __warned; \
103 : int __ret_warn_once = !!(condition); \
104 : \
105 : if (unlikely(__ret_warn_once && !__warned)) { \
106 : __warned = true; \
107 : pr_err("ERROR: " fmt, ##__VA_ARGS__); \
108 : } \
109 : unlikely(__ret_warn_once); \
110 : })
111 :
112 : /*
113 : * syscalls are special, and need special handling, this is why
114 : * they are not included in trace_entries.h
115 : */
116 : struct syscall_trace_enter {
117 : struct trace_entry ent;
118 : int nr;
119 : unsigned long args[];
120 : };
121 :
122 : struct syscall_trace_exit {
123 : struct trace_entry ent;
124 : int nr;
125 : long ret;
126 : };
127 :
128 : struct kprobe_trace_entry_head {
129 : struct trace_entry ent;
130 : unsigned long ip;
131 : };
132 :
133 : struct kretprobe_trace_entry_head {
134 : struct trace_entry ent;
135 : unsigned long func;
136 : unsigned long ret_ip;
137 : };
138 :
139 : #define TRACE_BUF_SIZE 1024
140 :
141 : struct trace_array;
142 :
143 : /*
144 : * The CPU trace array - it consists of thousands of trace entries
145 : * plus some other descriptor data: (for example which task started
146 : * the trace, etc.)
147 : */
148 : struct trace_array_cpu {
149 : atomic_t disabled;
150 : void *buffer_page; /* ring buffer spare */
151 :
152 : unsigned long entries;
153 : unsigned long saved_latency;
154 : unsigned long critical_start;
155 : unsigned long critical_end;
156 : unsigned long critical_sequence;
157 : unsigned long nice;
158 : unsigned long policy;
159 : unsigned long rt_priority;
160 : unsigned long skipped_entries;
161 : u64 preempt_timestamp;
162 : pid_t pid;
163 : kuid_t uid;
164 : char comm[TASK_COMM_LEN];
165 :
166 : #ifdef CONFIG_FUNCTION_TRACER
167 : int ftrace_ignore_pid;
168 : #endif
169 : bool ignore_pid;
170 : };
171 :
172 : struct tracer;
173 : struct trace_option_dentry;
174 :
175 : struct array_buffer {
176 : struct trace_array *tr;
177 : struct trace_buffer *buffer;
178 : struct trace_array_cpu __percpu *data;
179 : u64 time_start;
180 : int cpu;
181 : };
182 :
183 : #define TRACE_FLAGS_MAX_SIZE 32
184 :
185 : struct trace_options {
186 : struct tracer *tracer;
187 : struct trace_option_dentry *topts;
188 : };
189 :
190 : struct trace_pid_list {
191 : int pid_max;
192 : unsigned long *pids;
193 : };
194 :
195 : enum {
196 : TRACE_PIDS = BIT(0),
197 : TRACE_NO_PIDS = BIT(1),
198 : };
199 :
200 0 : static inline bool pid_type_enabled(int type, struct trace_pid_list *pid_list,
201 : struct trace_pid_list *no_pid_list)
202 : {
203 : /* Return true if the pid list in type has pids */
204 0 : return ((type & TRACE_PIDS) && pid_list) ||
205 0 : ((type & TRACE_NO_PIDS) && no_pid_list);
206 : }
207 :
208 0 : static inline bool still_need_pid_events(int type, struct trace_pid_list *pid_list,
209 : struct trace_pid_list *no_pid_list)
210 : {
211 : /*
212 : * Turning off what is in @type, return true if the "other"
213 : * pid list, still has pids in it.
214 : */
215 0 : return (!(type & TRACE_PIDS) && pid_list) ||
216 0 : (!(type & TRACE_NO_PIDS) && no_pid_list);
217 : }
218 :
219 : typedef bool (*cond_update_fn_t)(struct trace_array *tr, void *cond_data);
220 :
221 : /**
222 : * struct cond_snapshot - conditional snapshot data and callback
223 : *
224 : * The cond_snapshot structure encapsulates a callback function and
225 : * data associated with the snapshot for a given tracing instance.
226 : *
227 : * When a snapshot is taken conditionally, by invoking
228 : * tracing_snapshot_cond(tr, cond_data), the cond_data passed in is
229 : * passed in turn to the cond_snapshot.update() function. That data
230 : * can be compared by the update() implementation with the cond_data
231 : * contained within the struct cond_snapshot instance associated with
232 : * the trace_array. Because the tr->max_lock is held throughout the
233 : * update() call, the update() function can directly retrieve the
234 : * cond_snapshot and cond_data associated with the per-instance
235 : * snapshot associated with the trace_array.
236 : *
237 : * The cond_snapshot.update() implementation can save data to be
238 : * associated with the snapshot if it decides to, and returns 'true'
239 : * in that case, or it returns 'false' if the conditional snapshot
240 : * shouldn't be taken.
241 : *
242 : * The cond_snapshot instance is created and associated with the
243 : * user-defined cond_data by tracing_cond_snapshot_enable().
244 : * Likewise, the cond_snapshot instance is destroyed and is no longer
245 : * associated with the trace instance by
246 : * tracing_cond_snapshot_disable().
247 : *
248 : * The method below is required.
249 : *
250 : * @update: When a conditional snapshot is invoked, the update()
251 : * callback function is invoked with the tr->max_lock held. The
252 : * update() implementation signals whether or not to actually
253 : * take the snapshot, by returning 'true' if so, 'false' if no
254 : * snapshot should be taken. Because the max_lock is held for
255 : * the duration of update(), the implementation is safe to
256 : * directly retrieved and save any implementation data it needs
257 : * to in association with the snapshot.
258 : */
259 : struct cond_snapshot {
260 : void *cond_data;
261 : cond_update_fn_t update;
262 : };
263 :
264 : /*
265 : * The trace array - an array of per-CPU trace arrays. This is the
266 : * highest level data structure that individual tracers deal with.
267 : * They have on/off state as well:
268 : */
269 : struct trace_array {
270 : struct list_head list;
271 : char *name;
272 : struct array_buffer array_buffer;
273 : #ifdef CONFIG_TRACER_MAX_TRACE
274 : /*
275 : * The max_buffer is used to snapshot the trace when a maximum
276 : * latency is reached, or when the user initiates a snapshot.
277 : * Some tracers will use this to store a maximum trace while
278 : * it continues examining live traces.
279 : *
280 : * The buffers for the max_buffer are set up the same as the array_buffer
281 : * When a snapshot is taken, the buffer of the max_buffer is swapped
282 : * with the buffer of the array_buffer and the buffers are reset for
283 : * the array_buffer so the tracing can continue.
284 : */
285 : struct array_buffer max_buffer;
286 : bool allocated_snapshot;
287 : #endif
288 : #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)
289 : unsigned long max_latency;
290 : #ifdef CONFIG_FSNOTIFY
291 : struct dentry *d_max_latency;
292 : struct work_struct fsnotify_work;
293 : struct irq_work fsnotify_irqwork;
294 : #endif
295 : #endif
296 : struct trace_pid_list __rcu *filtered_pids;
297 : struct trace_pid_list __rcu *filtered_no_pids;
298 : /*
299 : * max_lock is used to protect the swapping of buffers
300 : * when taking a max snapshot. The buffers themselves are
301 : * protected by per_cpu spinlocks. But the action of the swap
302 : * needs its own lock.
303 : *
304 : * This is defined as a arch_spinlock_t in order to help
305 : * with performance when lockdep debugging is enabled.
306 : *
307 : * It is also used in other places outside the update_max_tr
308 : * so it needs to be defined outside of the
309 : * CONFIG_TRACER_MAX_TRACE.
310 : */
311 : arch_spinlock_t max_lock;
312 : int buffer_disabled;
313 : #ifdef CONFIG_FTRACE_SYSCALLS
314 : int sys_refcount_enter;
315 : int sys_refcount_exit;
316 : struct trace_event_file __rcu *enter_syscall_files[NR_syscalls];
317 : struct trace_event_file __rcu *exit_syscall_files[NR_syscalls];
318 : #endif
319 : int stop_count;
320 : int clock_id;
321 : int nr_topts;
322 : bool clear_trace;
323 : int buffer_percent;
324 : unsigned int n_err_log_entries;
325 : struct tracer *current_trace;
326 : unsigned int trace_flags;
327 : unsigned char trace_flags_index[TRACE_FLAGS_MAX_SIZE];
328 : unsigned int flags;
329 : raw_spinlock_t start_lock;
330 : struct list_head err_log;
331 : struct dentry *dir;
332 : struct dentry *options;
333 : struct dentry *percpu_dir;
334 : struct dentry *event_dir;
335 : struct trace_options *topts;
336 : struct list_head systems;
337 : struct list_head events;
338 : struct trace_event_file *trace_marker_file;
339 : cpumask_var_t tracing_cpumask; /* only trace on set CPUs */
340 : int ref;
341 : int trace_ref;
342 : #ifdef CONFIG_FUNCTION_TRACER
343 : struct ftrace_ops *ops;
344 : struct trace_pid_list __rcu *function_pids;
345 : struct trace_pid_list __rcu *function_no_pids;
346 : #ifdef CONFIG_DYNAMIC_FTRACE
347 : /* All of these are protected by the ftrace_lock */
348 : struct list_head func_probes;
349 : struct list_head mod_trace;
350 : struct list_head mod_notrace;
351 : #endif
352 : /* function tracing enabled */
353 : int function_enabled;
354 : #endif
355 : int time_stamp_abs_ref;
356 : struct list_head hist_vars;
357 : #ifdef CONFIG_TRACER_SNAPSHOT
358 : struct cond_snapshot *cond_snapshot;
359 : #endif
360 : };
361 :
362 : enum {
363 : TRACE_ARRAY_FL_GLOBAL = (1 << 0)
364 : };
365 :
366 : extern struct list_head ftrace_trace_arrays;
367 :
368 : extern struct mutex trace_types_lock;
369 :
370 : extern int trace_array_get(struct trace_array *tr);
371 : extern int tracing_check_open_get_tr(struct trace_array *tr);
372 : extern struct trace_array *trace_array_find(const char *instance);
373 : extern struct trace_array *trace_array_find_get(const char *instance);
374 :
375 : extern int tracing_set_time_stamp_abs(struct trace_array *tr, bool abs);
376 : extern int tracing_set_clock(struct trace_array *tr, const char *clockstr);
377 :
378 : extern bool trace_clock_in_ns(struct trace_array *tr);
379 :
380 : /*
381 : * The global tracer (top) should be the first trace array added,
382 : * but we check the flag anyway.
383 : */
384 3 : static inline struct trace_array *top_trace_array(void)
385 : {
386 3 : struct trace_array *tr;
387 :
388 3 : if (list_empty(&ftrace_trace_arrays))
389 : return NULL;
390 :
391 3 : tr = list_entry(ftrace_trace_arrays.prev,
392 : typeof(*tr), list);
393 3 : WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
394 : return tr;
395 : }
396 :
397 : #define FTRACE_CMP_TYPE(var, type) \
398 : __builtin_types_compatible_p(typeof(var), type *)
399 :
400 : #undef IF_ASSIGN
401 : #define IF_ASSIGN(var, entry, etype, id) \
402 : if (FTRACE_CMP_TYPE(var, etype)) { \
403 : var = (typeof(var))(entry); \
404 : WARN_ON(id != 0 && (entry)->type != id); \
405 : break; \
406 : }
407 :
408 : /* Will cause compile errors if type is not found. */
409 : extern void __ftrace_bad_type(void);
410 :
411 : /*
412 : * The trace_assign_type is a verifier that the entry type is
413 : * the same as the type being assigned. To add new types simply
414 : * add a line with the following format:
415 : *
416 : * IF_ASSIGN(var, ent, type, id);
417 : *
418 : * Where "type" is the trace type that includes the trace_entry
419 : * as the "ent" item. And "id" is the trace identifier that is
420 : * used in the trace_type enum.
421 : *
422 : * If the type can have more than one id, then use zero.
423 : */
424 : #define trace_assign_type(var, ent) \
425 : do { \
426 : IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
427 : IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
428 : IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
429 : IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
430 : IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
431 : IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
432 : IF_ASSIGN(var, ent, struct bputs_entry, TRACE_BPUTS); \
433 : IF_ASSIGN(var, ent, struct hwlat_entry, TRACE_HWLAT); \
434 : IF_ASSIGN(var, ent, struct raw_data_entry, TRACE_RAW_DATA);\
435 : IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
436 : TRACE_MMIO_RW); \
437 : IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
438 : TRACE_MMIO_MAP); \
439 : IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
440 : IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
441 : TRACE_GRAPH_ENT); \
442 : IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
443 : TRACE_GRAPH_RET); \
444 : __ftrace_bad_type(); \
445 : } while (0)
446 :
447 : /*
448 : * An option specific to a tracer. This is a boolean value.
449 : * The bit is the bit index that sets its value on the
450 : * flags value in struct tracer_flags.
451 : */
452 : struct tracer_opt {
453 : const char *name; /* Will appear on the trace_options file */
454 : u32 bit; /* Mask assigned in val field in tracer_flags */
455 : };
456 :
457 : /*
458 : * The set of specific options for a tracer. Your tracer
459 : * have to set the initial value of the flags val.
460 : */
461 : struct tracer_flags {
462 : u32 val;
463 : struct tracer_opt *opts;
464 : struct tracer *trace;
465 : };
466 :
467 : /* Makes more easy to define a tracer opt */
468 : #define TRACER_OPT(s, b) .name = #s, .bit = b
469 :
470 :
471 : struct trace_option_dentry {
472 : struct tracer_opt *opt;
473 : struct tracer_flags *flags;
474 : struct trace_array *tr;
475 : struct dentry *entry;
476 : };
477 :
478 : /**
479 : * struct tracer - a specific tracer and its callbacks to interact with tracefs
480 : * @name: the name chosen to select it on the available_tracers file
481 : * @init: called when one switches to this tracer (echo name > current_tracer)
482 : * @reset: called when one switches to another tracer
483 : * @start: called when tracing is unpaused (echo 1 > tracing_on)
484 : * @stop: called when tracing is paused (echo 0 > tracing_on)
485 : * @update_thresh: called when tracing_thresh is updated
486 : * @open: called when the trace file is opened
487 : * @pipe_open: called when the trace_pipe file is opened
488 : * @close: called when the trace file is released
489 : * @pipe_close: called when the trace_pipe file is released
490 : * @read: override the default read callback on trace_pipe
491 : * @splice_read: override the default splice_read callback on trace_pipe
492 : * @selftest: selftest to run on boot (see trace_selftest.c)
493 : * @print_headers: override the first lines that describe your columns
494 : * @print_line: callback that prints a trace
495 : * @set_flag: signals one of your private flags changed (trace_options file)
496 : * @flags: your private flags
497 : */
498 : struct tracer {
499 : const char *name;
500 : int (*init)(struct trace_array *tr);
501 : void (*reset)(struct trace_array *tr);
502 : void (*start)(struct trace_array *tr);
503 : void (*stop)(struct trace_array *tr);
504 : int (*update_thresh)(struct trace_array *tr);
505 : void (*open)(struct trace_iterator *iter);
506 : void (*pipe_open)(struct trace_iterator *iter);
507 : void (*close)(struct trace_iterator *iter);
508 : void (*pipe_close)(struct trace_iterator *iter);
509 : ssize_t (*read)(struct trace_iterator *iter,
510 : struct file *filp, char __user *ubuf,
511 : size_t cnt, loff_t *ppos);
512 : ssize_t (*splice_read)(struct trace_iterator *iter,
513 : struct file *filp,
514 : loff_t *ppos,
515 : struct pipe_inode_info *pipe,
516 : size_t len,
517 : unsigned int flags);
518 : #ifdef CONFIG_FTRACE_STARTUP_TEST
519 : int (*selftest)(struct tracer *trace,
520 : struct trace_array *tr);
521 : #endif
522 : void (*print_header)(struct seq_file *m);
523 : enum print_line_t (*print_line)(struct trace_iterator *iter);
524 : /* If you handled the flag setting, return 0 */
525 : int (*set_flag)(struct trace_array *tr,
526 : u32 old_flags, u32 bit, int set);
527 : /* Return 0 if OK with change, else return non-zero */
528 : int (*flag_changed)(struct trace_array *tr,
529 : u32 mask, int set);
530 : struct tracer *next;
531 : struct tracer_flags *flags;
532 : int enabled;
533 : bool print_max;
534 : bool allow_instances;
535 : #ifdef CONFIG_TRACER_MAX_TRACE
536 : bool use_max_tr;
537 : #endif
538 : /* True if tracer cannot be enabled in kernel param */
539 : bool noboot;
540 : };
541 :
542 : static inline struct ring_buffer_iter *
543 0 : trace_buffer_iter(struct trace_iterator *iter, int cpu)
544 : {
545 0 : return iter->buffer_iter ? iter->buffer_iter[cpu] : NULL;
546 : }
547 :
548 : int tracer_init(struct tracer *t, struct trace_array *tr);
549 : int tracing_is_enabled(void);
550 : void tracing_reset_online_cpus(struct array_buffer *buf);
551 : void tracing_reset_current(int cpu);
552 : void tracing_reset_all_online_cpus(void);
553 : int tracing_open_generic(struct inode *inode, struct file *filp);
554 : int tracing_open_generic_tr(struct inode *inode, struct file *filp);
555 : bool tracing_is_disabled(void);
556 : bool tracer_tracing_is_on(struct trace_array *tr);
557 : void tracer_tracing_on(struct trace_array *tr);
558 : void tracer_tracing_off(struct trace_array *tr);
559 : struct dentry *trace_create_file(const char *name,
560 : umode_t mode,
561 : struct dentry *parent,
562 : void *data,
563 : const struct file_operations *fops);
564 :
565 : int tracing_init_dentry(void);
566 :
567 : struct ring_buffer_event;
568 :
569 : struct ring_buffer_event *
570 : trace_buffer_lock_reserve(struct trace_buffer *buffer,
571 : int type,
572 : unsigned long len,
573 : unsigned int trace_ctx);
574 :
575 : struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
576 : struct trace_array_cpu *data);
577 :
578 : struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
579 : int *ent_cpu, u64 *ent_ts);
580 :
581 : void trace_buffer_unlock_commit_nostack(struct trace_buffer *buffer,
582 : struct ring_buffer_event *event);
583 :
584 : const char *trace_event_format(struct trace_iterator *iter, const char *fmt);
585 :
586 : int trace_empty(struct trace_iterator *iter);
587 :
588 : void *trace_find_next_entry_inc(struct trace_iterator *iter);
589 :
590 : void trace_init_global_iter(struct trace_iterator *iter);
591 :
592 : void tracing_iter_reset(struct trace_iterator *iter, int cpu);
593 :
594 : unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu);
595 : unsigned long trace_total_entries(struct trace_array *tr);
596 :
597 : void trace_function(struct trace_array *tr,
598 : unsigned long ip,
599 : unsigned long parent_ip,
600 : unsigned int trace_ctx);
601 : void trace_graph_function(struct trace_array *tr,
602 : unsigned long ip,
603 : unsigned long parent_ip,
604 : unsigned int trace_ctx);
605 : void trace_latency_header(struct seq_file *m);
606 : void trace_default_header(struct seq_file *m);
607 : void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
608 :
609 : void trace_graph_return(struct ftrace_graph_ret *trace);
610 : int trace_graph_entry(struct ftrace_graph_ent *trace);
611 : void set_graph_array(struct trace_array *tr);
612 :
613 : void tracing_start_cmdline_record(void);
614 : void tracing_stop_cmdline_record(void);
615 : void tracing_start_tgid_record(void);
616 : void tracing_stop_tgid_record(void);
617 :
618 : int register_tracer(struct tracer *type);
619 : int is_tracing_stopped(void);
620 :
621 : loff_t tracing_lseek(struct file *file, loff_t offset, int whence);
622 :
623 : extern cpumask_var_t __read_mostly tracing_buffer_mask;
624 :
625 : #define for_each_tracing_cpu(cpu) \
626 : for_each_cpu(cpu, tracing_buffer_mask)
627 :
628 : extern unsigned long nsecs_to_usecs(unsigned long nsecs);
629 :
630 : extern unsigned long tracing_thresh;
631 :
632 : /* PID filtering */
633 :
634 : extern int pid_max;
635 :
636 : bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids,
637 : pid_t search_pid);
638 : bool trace_ignore_this_task(struct trace_pid_list *filtered_pids,
639 : struct trace_pid_list *filtered_no_pids,
640 : struct task_struct *task);
641 : void trace_filter_add_remove_task(struct trace_pid_list *pid_list,
642 : struct task_struct *self,
643 : struct task_struct *task);
644 : void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos);
645 : void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos);
646 : int trace_pid_show(struct seq_file *m, void *v);
647 : void trace_free_pid_list(struct trace_pid_list *pid_list);
648 : int trace_pid_write(struct trace_pid_list *filtered_pids,
649 : struct trace_pid_list **new_pid_list,
650 : const char __user *ubuf, size_t cnt);
651 :
652 : #ifdef CONFIG_TRACER_MAX_TRACE
653 : void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu,
654 : void *cond_data);
655 : void update_max_tr_single(struct trace_array *tr,
656 : struct task_struct *tsk, int cpu);
657 : #endif /* CONFIG_TRACER_MAX_TRACE */
658 :
659 : #if (defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)) && \
660 : defined(CONFIG_FSNOTIFY)
661 :
662 : void latency_fsnotify(struct trace_array *tr);
663 :
664 : #else
665 :
666 : static inline void latency_fsnotify(struct trace_array *tr) { }
667 :
668 : #endif
669 :
670 : #ifdef CONFIG_STACKTRACE
671 : void __trace_stack(struct trace_array *tr, unsigned int trace_ctx, int skip);
672 : #else
673 : static inline void __trace_stack(struct trace_array *tr, unsigned int trace_ctx,
674 : int skip)
675 : {
676 : }
677 : #endif /* CONFIG_STACKTRACE */
678 :
679 : extern u64 ftrace_now(int cpu);
680 :
681 : extern void trace_find_cmdline(int pid, char comm[]);
682 : extern int trace_find_tgid(int pid);
683 : extern void trace_event_follow_fork(struct trace_array *tr, bool enable);
684 :
685 : #ifdef CONFIG_DYNAMIC_FTRACE
686 : extern unsigned long ftrace_update_tot_cnt;
687 : extern unsigned long ftrace_number_of_pages;
688 : extern unsigned long ftrace_number_of_groups;
689 : void ftrace_init_trace_array(struct trace_array *tr);
690 : #else
691 : static inline void ftrace_init_trace_array(struct trace_array *tr) { }
692 : #endif
693 : #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
694 : extern int DYN_FTRACE_TEST_NAME(void);
695 : #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
696 : extern int DYN_FTRACE_TEST_NAME2(void);
697 :
698 : extern bool ring_buffer_expanded;
699 : extern bool tracing_selftest_disabled;
700 :
701 : #ifdef CONFIG_FTRACE_STARTUP_TEST
702 : extern void __init disable_tracing_selftest(const char *reason);
703 :
704 : extern int trace_selftest_startup_function(struct tracer *trace,
705 : struct trace_array *tr);
706 : extern int trace_selftest_startup_function_graph(struct tracer *trace,
707 : struct trace_array *tr);
708 : extern int trace_selftest_startup_irqsoff(struct tracer *trace,
709 : struct trace_array *tr);
710 : extern int trace_selftest_startup_preemptoff(struct tracer *trace,
711 : struct trace_array *tr);
712 : extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
713 : struct trace_array *tr);
714 : extern int trace_selftest_startup_wakeup(struct tracer *trace,
715 : struct trace_array *tr);
716 : extern int trace_selftest_startup_nop(struct tracer *trace,
717 : struct trace_array *tr);
718 : extern int trace_selftest_startup_branch(struct tracer *trace,
719 : struct trace_array *tr);
720 : /*
721 : * Tracer data references selftest functions that only occur
722 : * on boot up. These can be __init functions. Thus, when selftests
723 : * are enabled, then the tracers need to reference __init functions.
724 : */
725 : #define __tracer_data __refdata
726 : #else
727 0 : static inline void __init disable_tracing_selftest(const char *reason)
728 : {
729 0 : }
730 : /* Tracers are seldom changed. Optimize when selftests are disabled. */
731 : #define __tracer_data __read_mostly
732 : #endif /* CONFIG_FTRACE_STARTUP_TEST */
733 :
734 : extern void *head_page(struct trace_array_cpu *data);
735 : extern unsigned long long ns2usecs(u64 nsec);
736 : extern int
737 : trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
738 : extern int
739 : trace_vprintk(unsigned long ip, const char *fmt, va_list args);
740 : extern int
741 : trace_array_vprintk(struct trace_array *tr,
742 : unsigned long ip, const char *fmt, va_list args);
743 : int trace_array_printk_buf(struct trace_buffer *buffer,
744 : unsigned long ip, const char *fmt, ...);
745 : void trace_printk_seq(struct trace_seq *s);
746 : enum print_line_t print_trace_line(struct trace_iterator *iter);
747 :
748 : extern char trace_find_mark(unsigned long long duration);
749 :
750 : struct ftrace_hash;
751 :
752 : struct ftrace_mod_load {
753 : struct list_head list;
754 : char *func;
755 : char *module;
756 : int enable;
757 : };
758 :
759 : enum {
760 : FTRACE_HASH_FL_MOD = (1 << 0),
761 : };
762 :
763 : struct ftrace_hash {
764 : unsigned long size_bits;
765 : struct hlist_head *buckets;
766 : unsigned long count;
767 : unsigned long flags;
768 : struct rcu_head rcu;
769 : };
770 :
771 : struct ftrace_func_entry *
772 : ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip);
773 :
774 : static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash)
775 : {
776 : return !hash || !(hash->count || (hash->flags & FTRACE_HASH_FL_MOD));
777 : }
778 :
779 : /* Standard output formatting function used for function return traces */
780 : #ifdef CONFIG_FUNCTION_GRAPH_TRACER
781 :
782 : /* Flag options */
783 : #define TRACE_GRAPH_PRINT_OVERRUN 0x1
784 : #define TRACE_GRAPH_PRINT_CPU 0x2
785 : #define TRACE_GRAPH_PRINT_OVERHEAD 0x4
786 : #define TRACE_GRAPH_PRINT_PROC 0x8
787 : #define TRACE_GRAPH_PRINT_DURATION 0x10
788 : #define TRACE_GRAPH_PRINT_ABS_TIME 0x20
789 : #define TRACE_GRAPH_PRINT_REL_TIME 0x40
790 : #define TRACE_GRAPH_PRINT_IRQS 0x80
791 : #define TRACE_GRAPH_PRINT_TAIL 0x100
792 : #define TRACE_GRAPH_SLEEP_TIME 0x200
793 : #define TRACE_GRAPH_GRAPH_TIME 0x400
794 : #define TRACE_GRAPH_PRINT_FILL_SHIFT 28
795 : #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
796 :
797 : extern void ftrace_graph_sleep_time_control(bool enable);
798 :
799 : #ifdef CONFIG_FUNCTION_PROFILER
800 : extern void ftrace_graph_graph_time_control(bool enable);
801 : #else
802 : static inline void ftrace_graph_graph_time_control(bool enable) { }
803 : #endif
804 :
805 : extern enum print_line_t
806 : print_graph_function_flags(struct trace_iterator *iter, u32 flags);
807 : extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
808 : extern void
809 : trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
810 : extern void graph_trace_open(struct trace_iterator *iter);
811 : extern void graph_trace_close(struct trace_iterator *iter);
812 : extern int __trace_graph_entry(struct trace_array *tr,
813 : struct ftrace_graph_ent *trace,
814 : unsigned int trace_ctx);
815 : extern void __trace_graph_return(struct trace_array *tr,
816 : struct ftrace_graph_ret *trace,
817 : unsigned int trace_ctx);
818 :
819 : #ifdef CONFIG_DYNAMIC_FTRACE
820 : extern struct ftrace_hash __rcu *ftrace_graph_hash;
821 : extern struct ftrace_hash __rcu *ftrace_graph_notrace_hash;
822 :
823 : static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
824 : {
825 : unsigned long addr = trace->func;
826 : int ret = 0;
827 : struct ftrace_hash *hash;
828 :
829 : preempt_disable_notrace();
830 :
831 : /*
832 : * Have to open code "rcu_dereference_sched()" because the
833 : * function graph tracer can be called when RCU is not
834 : * "watching".
835 : * Protected with schedule_on_each_cpu(ftrace_sync)
836 : */
837 : hash = rcu_dereference_protected(ftrace_graph_hash, !preemptible());
838 :
839 : if (ftrace_hash_empty(hash)) {
840 : ret = 1;
841 : goto out;
842 : }
843 :
844 : if (ftrace_lookup_ip(hash, addr)) {
845 :
846 : /*
847 : * This needs to be cleared on the return functions
848 : * when the depth is zero.
849 : */
850 : trace_recursion_set(TRACE_GRAPH_BIT);
851 : trace_recursion_set_depth(trace->depth);
852 :
853 : /*
854 : * If no irqs are to be traced, but a set_graph_function
855 : * is set, and called by an interrupt handler, we still
856 : * want to trace it.
857 : */
858 : if (in_irq())
859 : trace_recursion_set(TRACE_IRQ_BIT);
860 : else
861 : trace_recursion_clear(TRACE_IRQ_BIT);
862 : ret = 1;
863 : }
864 :
865 : out:
866 : preempt_enable_notrace();
867 : return ret;
868 : }
869 :
870 : static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
871 : {
872 : if (trace_recursion_test(TRACE_GRAPH_BIT) &&
873 : trace->depth == trace_recursion_depth())
874 : trace_recursion_clear(TRACE_GRAPH_BIT);
875 : }
876 :
877 : static inline int ftrace_graph_notrace_addr(unsigned long addr)
878 : {
879 : int ret = 0;
880 : struct ftrace_hash *notrace_hash;
881 :
882 : preempt_disable_notrace();
883 :
884 : /*
885 : * Have to open code "rcu_dereference_sched()" because the
886 : * function graph tracer can be called when RCU is not
887 : * "watching".
888 : * Protected with schedule_on_each_cpu(ftrace_sync)
889 : */
890 : notrace_hash = rcu_dereference_protected(ftrace_graph_notrace_hash,
891 : !preemptible());
892 :
893 : if (ftrace_lookup_ip(notrace_hash, addr))
894 : ret = 1;
895 :
896 : preempt_enable_notrace();
897 : return ret;
898 : }
899 : #else
900 : static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
901 : {
902 : return 1;
903 : }
904 :
905 : static inline int ftrace_graph_notrace_addr(unsigned long addr)
906 : {
907 : return 0;
908 : }
909 : static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
910 : { }
911 : #endif /* CONFIG_DYNAMIC_FTRACE */
912 :
913 : extern unsigned int fgraph_max_depth;
914 :
915 : static inline bool ftrace_graph_ignore_func(struct ftrace_graph_ent *trace)
916 : {
917 : /* trace it when it is-nested-in or is a function enabled. */
918 : return !(trace_recursion_test(TRACE_GRAPH_BIT) ||
919 : ftrace_graph_addr(trace)) ||
920 : (trace->depth < 0) ||
921 : (fgraph_max_depth && trace->depth >= fgraph_max_depth);
922 : }
923 :
924 : #else /* CONFIG_FUNCTION_GRAPH_TRACER */
925 : static inline enum print_line_t
926 : print_graph_function_flags(struct trace_iterator *iter, u32 flags)
927 : {
928 : return TRACE_TYPE_UNHANDLED;
929 : }
930 : #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
931 :
932 : extern struct list_head ftrace_pids;
933 :
934 : #ifdef CONFIG_FUNCTION_TRACER
935 :
936 : #define FTRACE_PID_IGNORE -1
937 : #define FTRACE_PID_TRACE -2
938 :
939 : struct ftrace_func_command {
940 : struct list_head list;
941 : char *name;
942 : int (*func)(struct trace_array *tr,
943 : struct ftrace_hash *hash,
944 : char *func, char *cmd,
945 : char *params, int enable);
946 : };
947 : extern bool ftrace_filter_param __initdata;
948 : static inline int ftrace_trace_task(struct trace_array *tr)
949 : {
950 : return this_cpu_read(tr->array_buffer.data->ftrace_ignore_pid) !=
951 : FTRACE_PID_IGNORE;
952 : }
953 : extern int ftrace_is_dead(void);
954 : int ftrace_create_function_files(struct trace_array *tr,
955 : struct dentry *parent);
956 : void ftrace_destroy_function_files(struct trace_array *tr);
957 : int ftrace_allocate_ftrace_ops(struct trace_array *tr);
958 : void ftrace_free_ftrace_ops(struct trace_array *tr);
959 : void ftrace_init_global_array_ops(struct trace_array *tr);
960 : void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func);
961 : void ftrace_reset_array_ops(struct trace_array *tr);
962 : void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer);
963 : void ftrace_init_tracefs_toplevel(struct trace_array *tr,
964 : struct dentry *d_tracer);
965 : void ftrace_clear_pids(struct trace_array *tr);
966 : int init_function_trace(void);
967 : void ftrace_pid_follow_fork(struct trace_array *tr, bool enable);
968 : #else
969 : static inline int ftrace_trace_task(struct trace_array *tr)
970 : {
971 : return 1;
972 : }
973 0 : static inline int ftrace_is_dead(void) { return 0; }
974 : static inline int
975 1 : ftrace_create_function_files(struct trace_array *tr,
976 : struct dentry *parent)
977 : {
978 1 : return 0;
979 : }
980 : static inline int ftrace_allocate_ftrace_ops(struct trace_array *tr)
981 : {
982 : return 0;
983 : }
984 0 : static inline void ftrace_free_ftrace_ops(struct trace_array *tr) { }
985 0 : static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
986 : static inline __init void
987 1 : ftrace_init_global_array_ops(struct trace_array *tr) { }
988 : static inline void ftrace_reset_array_ops(struct trace_array *tr) { }
989 1 : static inline void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d) { }
990 1 : static inline void ftrace_init_tracefs_toplevel(struct trace_array *tr, struct dentry *d) { }
991 0 : static inline void ftrace_clear_pids(struct trace_array *tr) { }
992 1 : static inline int init_function_trace(void) { return 0; }
993 : static inline void ftrace_pid_follow_fork(struct trace_array *tr, bool enable) { }
994 : /* ftace_func_t type is not defined, use macro instead of static inline */
995 : #define ftrace_init_array_ops(tr, func) do { } while (0)
996 : #endif /* CONFIG_FUNCTION_TRACER */
997 :
998 : #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
999 :
1000 : struct ftrace_probe_ops {
1001 : void (*func)(unsigned long ip,
1002 : unsigned long parent_ip,
1003 : struct trace_array *tr,
1004 : struct ftrace_probe_ops *ops,
1005 : void *data);
1006 : int (*init)(struct ftrace_probe_ops *ops,
1007 : struct trace_array *tr,
1008 : unsigned long ip, void *init_data,
1009 : void **data);
1010 : void (*free)(struct ftrace_probe_ops *ops,
1011 : struct trace_array *tr,
1012 : unsigned long ip, void *data);
1013 : int (*print)(struct seq_file *m,
1014 : unsigned long ip,
1015 : struct ftrace_probe_ops *ops,
1016 : void *data);
1017 : };
1018 :
1019 : struct ftrace_func_mapper;
1020 : typedef int (*ftrace_mapper_func)(void *data);
1021 :
1022 : struct ftrace_func_mapper *allocate_ftrace_func_mapper(void);
1023 : void **ftrace_func_mapper_find_ip(struct ftrace_func_mapper *mapper,
1024 : unsigned long ip);
1025 : int ftrace_func_mapper_add_ip(struct ftrace_func_mapper *mapper,
1026 : unsigned long ip, void *data);
1027 : void *ftrace_func_mapper_remove_ip(struct ftrace_func_mapper *mapper,
1028 : unsigned long ip);
1029 : void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper,
1030 : ftrace_mapper_func free_func);
1031 :
1032 : extern int
1033 : register_ftrace_function_probe(char *glob, struct trace_array *tr,
1034 : struct ftrace_probe_ops *ops, void *data);
1035 : extern int
1036 : unregister_ftrace_function_probe_func(char *glob, struct trace_array *tr,
1037 : struct ftrace_probe_ops *ops);
1038 : extern void clear_ftrace_function_probes(struct trace_array *tr);
1039 :
1040 : int register_ftrace_command(struct ftrace_func_command *cmd);
1041 : int unregister_ftrace_command(struct ftrace_func_command *cmd);
1042 :
1043 : void ftrace_create_filter_files(struct ftrace_ops *ops,
1044 : struct dentry *parent);
1045 : void ftrace_destroy_filter_files(struct ftrace_ops *ops);
1046 :
1047 : extern int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf,
1048 : int len, int reset);
1049 : extern int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf,
1050 : int len, int reset);
1051 : #else
1052 : struct ftrace_func_command;
1053 :
1054 : static inline __init int register_ftrace_command(struct ftrace_func_command *cmd)
1055 : {
1056 : return -EINVAL;
1057 : }
1058 : static inline __init int unregister_ftrace_command(char *cmd_name)
1059 : {
1060 : return -EINVAL;
1061 : }
1062 0 : static inline void clear_ftrace_function_probes(struct trace_array *tr)
1063 : {
1064 0 : }
1065 :
1066 : /*
1067 : * The ops parameter passed in is usually undefined.
1068 : * This must be a macro.
1069 : */
1070 : #define ftrace_create_filter_files(ops, parent) do { } while (0)
1071 : #define ftrace_destroy_filter_files(ops) do { } while (0)
1072 : #endif /* CONFIG_FUNCTION_TRACER && CONFIG_DYNAMIC_FTRACE */
1073 :
1074 : bool ftrace_event_is_function(struct trace_event_call *call);
1075 :
1076 : /*
1077 : * struct trace_parser - servers for reading the user input separated by spaces
1078 : * @cont: set if the input is not complete - no final space char was found
1079 : * @buffer: holds the parsed user input
1080 : * @idx: user input length
1081 : * @size: buffer size
1082 : */
1083 : struct trace_parser {
1084 : bool cont;
1085 : char *buffer;
1086 : unsigned idx;
1087 : unsigned size;
1088 : };
1089 :
1090 0 : static inline bool trace_parser_loaded(struct trace_parser *parser)
1091 : {
1092 0 : return (parser->idx != 0);
1093 : }
1094 :
1095 : static inline bool trace_parser_cont(struct trace_parser *parser)
1096 : {
1097 : return parser->cont;
1098 : }
1099 :
1100 0 : static inline void trace_parser_clear(struct trace_parser *parser)
1101 : {
1102 0 : parser->cont = false;
1103 0 : parser->idx = 0;
1104 0 : }
1105 :
1106 : extern int trace_parser_get_init(struct trace_parser *parser, int size);
1107 : extern void trace_parser_put(struct trace_parser *parser);
1108 : extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
1109 : size_t cnt, loff_t *ppos);
1110 :
1111 : /*
1112 : * Only create function graph options if function graph is configured.
1113 : */
1114 : #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1115 : # define FGRAPH_FLAGS \
1116 : C(DISPLAY_GRAPH, "display-graph"),
1117 : #else
1118 : # define FGRAPH_FLAGS
1119 : #endif
1120 :
1121 : #ifdef CONFIG_BRANCH_TRACER
1122 : # define BRANCH_FLAGS \
1123 : C(BRANCH, "branch"),
1124 : #else
1125 : # define BRANCH_FLAGS
1126 : #endif
1127 :
1128 : #ifdef CONFIG_FUNCTION_TRACER
1129 : # define FUNCTION_FLAGS \
1130 : C(FUNCTION, "function-trace"), \
1131 : C(FUNC_FORK, "function-fork"),
1132 : # define FUNCTION_DEFAULT_FLAGS TRACE_ITER_FUNCTION
1133 : #else
1134 : # define FUNCTION_FLAGS
1135 : # define FUNCTION_DEFAULT_FLAGS 0UL
1136 : # define TRACE_ITER_FUNC_FORK 0UL
1137 : #endif
1138 :
1139 : #ifdef CONFIG_STACKTRACE
1140 : # define STACK_FLAGS \
1141 : C(STACKTRACE, "stacktrace"),
1142 : #else
1143 : # define STACK_FLAGS
1144 : #endif
1145 :
1146 : /*
1147 : * trace_iterator_flags is an enumeration that defines bit
1148 : * positions into trace_flags that controls the output.
1149 : *
1150 : * NOTE: These bits must match the trace_options array in
1151 : * trace.c (this macro guarantees it).
1152 : */
1153 : #define TRACE_FLAGS \
1154 : C(PRINT_PARENT, "print-parent"), \
1155 : C(SYM_OFFSET, "sym-offset"), \
1156 : C(SYM_ADDR, "sym-addr"), \
1157 : C(VERBOSE, "verbose"), \
1158 : C(RAW, "raw"), \
1159 : C(HEX, "hex"), \
1160 : C(BIN, "bin"), \
1161 : C(BLOCK, "block"), \
1162 : C(PRINTK, "trace_printk"), \
1163 : C(ANNOTATE, "annotate"), \
1164 : C(USERSTACKTRACE, "userstacktrace"), \
1165 : C(SYM_USEROBJ, "sym-userobj"), \
1166 : C(PRINTK_MSGONLY, "printk-msg-only"), \
1167 : C(CONTEXT_INFO, "context-info"), /* Print pid/cpu/time */ \
1168 : C(LATENCY_FMT, "latency-format"), \
1169 : C(RECORD_CMD, "record-cmd"), \
1170 : C(RECORD_TGID, "record-tgid"), \
1171 : C(OVERWRITE, "overwrite"), \
1172 : C(STOP_ON_FREE, "disable_on_free"), \
1173 : C(IRQ_INFO, "irq-info"), \
1174 : C(MARKERS, "markers"), \
1175 : C(EVENT_FORK, "event-fork"), \
1176 : C(PAUSE_ON_TRACE, "pause-on-trace"), \
1177 : C(HASH_PTR, "hash-ptr"), /* Print hashed pointer */ \
1178 : FUNCTION_FLAGS \
1179 : FGRAPH_FLAGS \
1180 : STACK_FLAGS \
1181 : BRANCH_FLAGS
1182 :
1183 : /*
1184 : * By defining C, we can make TRACE_FLAGS a list of bit names
1185 : * that will define the bits for the flag masks.
1186 : */
1187 : #undef C
1188 : #define C(a, b) TRACE_ITER_##a##_BIT
1189 :
1190 : enum trace_iterator_bits {
1191 : TRACE_FLAGS
1192 : /* Make sure we don't go more than we have bits for */
1193 : TRACE_ITER_LAST_BIT
1194 : };
1195 :
1196 : /*
1197 : * By redefining C, we can make TRACE_FLAGS a list of masks that
1198 : * use the bits as defined above.
1199 : */
1200 : #undef C
1201 : #define C(a, b) TRACE_ITER_##a = (1 << TRACE_ITER_##a##_BIT)
1202 :
1203 : enum trace_iterator_flags { TRACE_FLAGS };
1204 :
1205 : /*
1206 : * TRACE_ITER_SYM_MASK masks the options in trace_flags that
1207 : * control the output of kernel symbols.
1208 : */
1209 : #define TRACE_ITER_SYM_MASK \
1210 : (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
1211 :
1212 : extern struct tracer nop_trace;
1213 :
1214 : #ifdef CONFIG_BRANCH_TRACER
1215 : extern int enable_branch_tracing(struct trace_array *tr);
1216 : extern void disable_branch_tracing(void);
1217 : static inline int trace_branch_enable(struct trace_array *tr)
1218 : {
1219 : if (tr->trace_flags & TRACE_ITER_BRANCH)
1220 : return enable_branch_tracing(tr);
1221 : return 0;
1222 : }
1223 : static inline void trace_branch_disable(void)
1224 : {
1225 : /* due to races, always disable */
1226 : disable_branch_tracing();
1227 : }
1228 : #else
1229 0 : static inline int trace_branch_enable(struct trace_array *tr)
1230 : {
1231 0 : return 0;
1232 : }
1233 0 : static inline void trace_branch_disable(void)
1234 : {
1235 0 : }
1236 : #endif /* CONFIG_BRANCH_TRACER */
1237 :
1238 : /* set ring buffers to default size if not already done so */
1239 : int tracing_update_buffers(void);
1240 :
1241 : struct ftrace_event_field {
1242 : struct list_head link;
1243 : const char *name;
1244 : const char *type;
1245 : int filter_type;
1246 : int offset;
1247 : int size;
1248 : int is_signed;
1249 : };
1250 :
1251 : struct prog_entry;
1252 :
1253 : struct event_filter {
1254 : struct prog_entry __rcu *prog;
1255 : char *filter_string;
1256 : };
1257 :
1258 : struct event_subsystem {
1259 : struct list_head list;
1260 : const char *name;
1261 : struct event_filter *filter;
1262 : int ref_count;
1263 : };
1264 :
1265 : struct trace_subsystem_dir {
1266 : struct list_head list;
1267 : struct event_subsystem *subsystem;
1268 : struct trace_array *tr;
1269 : struct dentry *entry;
1270 : int ref_count;
1271 : int nr_events;
1272 : };
1273 :
1274 : extern int call_filter_check_discard(struct trace_event_call *call, void *rec,
1275 : struct trace_buffer *buffer,
1276 : struct ring_buffer_event *event);
1277 :
1278 : void trace_buffer_unlock_commit_regs(struct trace_array *tr,
1279 : struct trace_buffer *buffer,
1280 : struct ring_buffer_event *event,
1281 : unsigned int trcace_ctx,
1282 : struct pt_regs *regs);
1283 :
1284 : static inline void trace_buffer_unlock_commit(struct trace_array *tr,
1285 : struct trace_buffer *buffer,
1286 : struct ring_buffer_event *event,
1287 : unsigned int trace_ctx)
1288 : {
1289 : trace_buffer_unlock_commit_regs(tr, buffer, event, trace_ctx, NULL);
1290 : }
1291 :
1292 : DECLARE_PER_CPU(struct ring_buffer_event *, trace_buffered_event);
1293 : DECLARE_PER_CPU(int, trace_buffered_event_cnt);
1294 : void trace_buffered_event_disable(void);
1295 : void trace_buffered_event_enable(void);
1296 :
1297 : static inline void
1298 0 : __trace_event_discard_commit(struct trace_buffer *buffer,
1299 : struct ring_buffer_event *event)
1300 : {
1301 0 : if (this_cpu_read(trace_buffered_event) == event) {
1302 : /* Simply release the temp buffer */
1303 0 : this_cpu_dec(trace_buffered_event_cnt);
1304 0 : return;
1305 : }
1306 0 : ring_buffer_discard_commit(buffer, event);
1307 : }
1308 :
1309 : /*
1310 : * Helper function for event_trigger_unlock_commit{_regs}().
1311 : * If there are event triggers attached to this event that requires
1312 : * filtering against its fields, then they will be called as the
1313 : * entry already holds the field information of the current event.
1314 : *
1315 : * It also checks if the event should be discarded or not.
1316 : * It is to be discarded if the event is soft disabled and the
1317 : * event was only recorded to process triggers, or if the event
1318 : * filter is active and this event did not match the filters.
1319 : *
1320 : * Returns true if the event is discarded, false otherwise.
1321 : */
1322 : static inline bool
1323 0 : __event_trigger_test_discard(struct trace_event_file *file,
1324 : struct trace_buffer *buffer,
1325 : struct ring_buffer_event *event,
1326 : void *entry,
1327 : enum event_trigger_type *tt)
1328 : {
1329 0 : unsigned long eflags = file->flags;
1330 :
1331 0 : if (eflags & EVENT_FILE_FL_TRIGGER_COND)
1332 0 : *tt = event_triggers_call(file, entry, event);
1333 :
1334 0 : if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) ||
1335 0 : (unlikely(file->flags & EVENT_FILE_FL_FILTERED) &&
1336 0 : !filter_match_preds(file->filter, entry))) {
1337 0 : __trace_event_discard_commit(buffer, event);
1338 0 : return true;
1339 : }
1340 :
1341 : return false;
1342 : }
1343 :
1344 : /**
1345 : * event_trigger_unlock_commit - handle triggers and finish event commit
1346 : * @file: The file pointer assoctiated to the event
1347 : * @buffer: The ring buffer that the event is being written to
1348 : * @event: The event meta data in the ring buffer
1349 : * @entry: The event itself
1350 : * @trace_ctx: The tracing context flags.
1351 : *
1352 : * This is a helper function to handle triggers that require data
1353 : * from the event itself. It also tests the event against filters and
1354 : * if the event is soft disabled and should be discarded.
1355 : */
1356 : static inline void
1357 : event_trigger_unlock_commit(struct trace_event_file *file,
1358 : struct trace_buffer *buffer,
1359 : struct ring_buffer_event *event,
1360 : void *entry, unsigned int trace_ctx)
1361 : {
1362 : enum event_trigger_type tt = ETT_NONE;
1363 :
1364 : if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1365 : trace_buffer_unlock_commit(file->tr, buffer, event, trace_ctx);
1366 :
1367 : if (tt)
1368 : event_triggers_post_call(file, tt);
1369 : }
1370 :
1371 : /**
1372 : * event_trigger_unlock_commit_regs - handle triggers and finish event commit
1373 : * @file: The file pointer assoctiated to the event
1374 : * @buffer: The ring buffer that the event is being written to
1375 : * @event: The event meta data in the ring buffer
1376 : * @entry: The event itself
1377 : * @trace_ctx: The tracing context flags.
1378 : *
1379 : * This is a helper function to handle triggers that require data
1380 : * from the event itself. It also tests the event against filters and
1381 : * if the event is soft disabled and should be discarded.
1382 : *
1383 : * Same as event_trigger_unlock_commit() but calls
1384 : * trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit().
1385 : */
1386 : static inline void
1387 0 : event_trigger_unlock_commit_regs(struct trace_event_file *file,
1388 : struct trace_buffer *buffer,
1389 : struct ring_buffer_event *event,
1390 : void *entry, unsigned int trace_ctx,
1391 : struct pt_regs *regs)
1392 : {
1393 0 : enum event_trigger_type tt = ETT_NONE;
1394 :
1395 0 : if (!__event_trigger_test_discard(file, buffer, event, entry, &tt))
1396 0 : trace_buffer_unlock_commit_regs(file->tr, buffer, event,
1397 : trace_ctx, regs);
1398 :
1399 0 : if (tt)
1400 0 : event_triggers_post_call(file, tt);
1401 0 : }
1402 :
1403 : #define FILTER_PRED_INVALID ((unsigned short)-1)
1404 : #define FILTER_PRED_IS_RIGHT (1 << 15)
1405 : #define FILTER_PRED_FOLD (1 << 15)
1406 :
1407 : /*
1408 : * The max preds is the size of unsigned short with
1409 : * two flags at the MSBs. One bit is used for both the IS_RIGHT
1410 : * and FOLD flags. The other is reserved.
1411 : *
1412 : * 2^14 preds is way more than enough.
1413 : */
1414 : #define MAX_FILTER_PRED 16384
1415 :
1416 : struct filter_pred;
1417 : struct regex;
1418 :
1419 : typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
1420 :
1421 : typedef int (*regex_match_func)(char *str, struct regex *r, int len);
1422 :
1423 : enum regex_type {
1424 : MATCH_FULL = 0,
1425 : MATCH_FRONT_ONLY,
1426 : MATCH_MIDDLE_ONLY,
1427 : MATCH_END_ONLY,
1428 : MATCH_GLOB,
1429 : MATCH_INDEX,
1430 : };
1431 :
1432 : struct regex {
1433 : char pattern[MAX_FILTER_STR_VAL];
1434 : int len;
1435 : int field_len;
1436 : regex_match_func match;
1437 : };
1438 :
1439 : struct filter_pred {
1440 : filter_pred_fn_t fn;
1441 : u64 val;
1442 : struct regex regex;
1443 : unsigned short *ops;
1444 : struct ftrace_event_field *field;
1445 : int offset;
1446 : int not;
1447 : int op;
1448 : };
1449 :
1450 0 : static inline bool is_string_field(struct ftrace_event_field *field)
1451 : {
1452 0 : return field->filter_type == FILTER_DYN_STRING ||
1453 : field->filter_type == FILTER_STATIC_STRING ||
1454 0 : field->filter_type == FILTER_PTR_STRING ||
1455 : field->filter_type == FILTER_COMM;
1456 : }
1457 :
1458 : static inline bool is_function_field(struct ftrace_event_field *field)
1459 : {
1460 : return field->filter_type == FILTER_TRACE_FN;
1461 : }
1462 :
1463 : extern enum regex_type
1464 : filter_parse_regex(char *buff, int len, char **search, int *not);
1465 : extern void print_event_filter(struct trace_event_file *file,
1466 : struct trace_seq *s);
1467 : extern int apply_event_filter(struct trace_event_file *file,
1468 : char *filter_string);
1469 : extern int apply_subsystem_event_filter(struct trace_subsystem_dir *dir,
1470 : char *filter_string);
1471 : extern void print_subsystem_event_filter(struct event_subsystem *system,
1472 : struct trace_seq *s);
1473 : extern int filter_assign_type(const char *type);
1474 : extern int create_event_filter(struct trace_array *tr,
1475 : struct trace_event_call *call,
1476 : char *filter_str, bool set_str,
1477 : struct event_filter **filterp);
1478 : extern void free_event_filter(struct event_filter *filter);
1479 :
1480 : struct ftrace_event_field *
1481 : trace_find_event_field(struct trace_event_call *call, char *name);
1482 :
1483 : extern void trace_event_enable_cmd_record(bool enable);
1484 : extern void trace_event_enable_tgid_record(bool enable);
1485 :
1486 : extern int event_trace_init(void);
1487 : extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
1488 : extern int event_trace_del_tracer(struct trace_array *tr);
1489 : extern void __trace_early_add_events(struct trace_array *tr);
1490 :
1491 : extern struct trace_event_file *__find_event_file(struct trace_array *tr,
1492 : const char *system,
1493 : const char *event);
1494 : extern struct trace_event_file *find_event_file(struct trace_array *tr,
1495 : const char *system,
1496 : const char *event);
1497 :
1498 0 : static inline void *event_file_data(struct file *filp)
1499 : {
1500 0 : return READ_ONCE(file_inode(filp)->i_private);
1501 : }
1502 :
1503 : extern struct mutex event_mutex;
1504 : extern struct list_head ftrace_events;
1505 :
1506 : extern const struct file_operations event_trigger_fops;
1507 : extern const struct file_operations event_hist_fops;
1508 : extern const struct file_operations event_hist_debug_fops;
1509 : extern const struct file_operations event_inject_fops;
1510 :
1511 : #ifdef CONFIG_HIST_TRIGGERS
1512 : extern int register_trigger_hist_cmd(void);
1513 : extern int register_trigger_hist_enable_disable_cmds(void);
1514 : #else
1515 1 : static inline int register_trigger_hist_cmd(void) { return 0; }
1516 1 : static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; }
1517 : #endif
1518 :
1519 : extern int register_trigger_cmds(void);
1520 : extern void clear_event_triggers(struct trace_array *tr);
1521 :
1522 : struct event_trigger_data {
1523 : unsigned long count;
1524 : int ref;
1525 : struct event_trigger_ops *ops;
1526 : struct event_command *cmd_ops;
1527 : struct event_filter __rcu *filter;
1528 : char *filter_str;
1529 : void *private_data;
1530 : bool paused;
1531 : bool paused_tmp;
1532 : struct list_head list;
1533 : char *name;
1534 : struct list_head named_list;
1535 : struct event_trigger_data *named_data;
1536 : };
1537 :
1538 : /* Avoid typos */
1539 : #define ENABLE_EVENT_STR "enable_event"
1540 : #define DISABLE_EVENT_STR "disable_event"
1541 : #define ENABLE_HIST_STR "enable_hist"
1542 : #define DISABLE_HIST_STR "disable_hist"
1543 :
1544 : struct enable_trigger_data {
1545 : struct trace_event_file *file;
1546 : bool enable;
1547 : bool hist;
1548 : };
1549 :
1550 : extern int event_enable_trigger_print(struct seq_file *m,
1551 : struct event_trigger_ops *ops,
1552 : struct event_trigger_data *data);
1553 : extern void event_enable_trigger_free(struct event_trigger_ops *ops,
1554 : struct event_trigger_data *data);
1555 : extern int event_enable_trigger_func(struct event_command *cmd_ops,
1556 : struct trace_event_file *file,
1557 : char *glob, char *cmd, char *param);
1558 : extern int event_enable_register_trigger(char *glob,
1559 : struct event_trigger_ops *ops,
1560 : struct event_trigger_data *data,
1561 : struct trace_event_file *file);
1562 : extern void event_enable_unregister_trigger(char *glob,
1563 : struct event_trigger_ops *ops,
1564 : struct event_trigger_data *test,
1565 : struct trace_event_file *file);
1566 : extern void trigger_data_free(struct event_trigger_data *data);
1567 : extern int event_trigger_init(struct event_trigger_ops *ops,
1568 : struct event_trigger_data *data);
1569 : extern int trace_event_trigger_enable_disable(struct trace_event_file *file,
1570 : int trigger_enable);
1571 : extern void update_cond_flag(struct trace_event_file *file);
1572 : extern int set_trigger_filter(char *filter_str,
1573 : struct event_trigger_data *trigger_data,
1574 : struct trace_event_file *file);
1575 : extern struct event_trigger_data *find_named_trigger(const char *name);
1576 : extern bool is_named_trigger(struct event_trigger_data *test);
1577 : extern int save_named_trigger(const char *name,
1578 : struct event_trigger_data *data);
1579 : extern void del_named_trigger(struct event_trigger_data *data);
1580 : extern void pause_named_trigger(struct event_trigger_data *data);
1581 : extern void unpause_named_trigger(struct event_trigger_data *data);
1582 : extern void set_named_trigger_data(struct event_trigger_data *data,
1583 : struct event_trigger_data *named_data);
1584 : extern struct event_trigger_data *
1585 : get_named_trigger_data(struct event_trigger_data *data);
1586 : extern int register_event_command(struct event_command *cmd);
1587 : extern int unregister_event_command(struct event_command *cmd);
1588 : extern int register_trigger_hist_enable_disable_cmds(void);
1589 :
1590 : /**
1591 : * struct event_trigger_ops - callbacks for trace event triggers
1592 : *
1593 : * The methods in this structure provide per-event trigger hooks for
1594 : * various trigger operations.
1595 : *
1596 : * All the methods below, except for @init() and @free(), must be
1597 : * implemented.
1598 : *
1599 : * @func: The trigger 'probe' function called when the triggering
1600 : * event occurs. The data passed into this callback is the data
1601 : * that was supplied to the event_command @reg() function that
1602 : * registered the trigger (see struct event_command) along with
1603 : * the trace record, rec.
1604 : *
1605 : * @init: An optional initialization function called for the trigger
1606 : * when the trigger is registered (via the event_command reg()
1607 : * function). This can be used to perform per-trigger
1608 : * initialization such as incrementing a per-trigger reference
1609 : * count, for instance. This is usually implemented by the
1610 : * generic utility function @event_trigger_init() (see
1611 : * trace_event_triggers.c).
1612 : *
1613 : * @free: An optional de-initialization function called for the
1614 : * trigger when the trigger is unregistered (via the
1615 : * event_command @reg() function). This can be used to perform
1616 : * per-trigger de-initialization such as decrementing a
1617 : * per-trigger reference count and freeing corresponding trigger
1618 : * data, for instance. This is usually implemented by the
1619 : * generic utility function @event_trigger_free() (see
1620 : * trace_event_triggers.c).
1621 : *
1622 : * @print: The callback function invoked to have the trigger print
1623 : * itself. This is usually implemented by a wrapper function
1624 : * that calls the generic utility function @event_trigger_print()
1625 : * (see trace_event_triggers.c).
1626 : */
1627 : struct event_trigger_ops {
1628 : void (*func)(struct event_trigger_data *data,
1629 : void *rec,
1630 : struct ring_buffer_event *rbe);
1631 : int (*init)(struct event_trigger_ops *ops,
1632 : struct event_trigger_data *data);
1633 : void (*free)(struct event_trigger_ops *ops,
1634 : struct event_trigger_data *data);
1635 : int (*print)(struct seq_file *m,
1636 : struct event_trigger_ops *ops,
1637 : struct event_trigger_data *data);
1638 : };
1639 :
1640 : /**
1641 : * struct event_command - callbacks and data members for event commands
1642 : *
1643 : * Event commands are invoked by users by writing the command name
1644 : * into the 'trigger' file associated with a trace event. The
1645 : * parameters associated with a specific invocation of an event
1646 : * command are used to create an event trigger instance, which is
1647 : * added to the list of trigger instances associated with that trace
1648 : * event. When the event is hit, the set of triggers associated with
1649 : * that event is invoked.
1650 : *
1651 : * The data members in this structure provide per-event command data
1652 : * for various event commands.
1653 : *
1654 : * All the data members below, except for @post_trigger, must be set
1655 : * for each event command.
1656 : *
1657 : * @name: The unique name that identifies the event command. This is
1658 : * the name used when setting triggers via trigger files.
1659 : *
1660 : * @trigger_type: A unique id that identifies the event command
1661 : * 'type'. This value has two purposes, the first to ensure that
1662 : * only one trigger of the same type can be set at a given time
1663 : * for a particular event e.g. it doesn't make sense to have both
1664 : * a traceon and traceoff trigger attached to a single event at
1665 : * the same time, so traceon and traceoff have the same type
1666 : * though they have different names. The @trigger_type value is
1667 : * also used as a bit value for deferring the actual trigger
1668 : * action until after the current event is finished. Some
1669 : * commands need to do this if they themselves log to the trace
1670 : * buffer (see the @post_trigger() member below). @trigger_type
1671 : * values are defined by adding new values to the trigger_type
1672 : * enum in include/linux/trace_events.h.
1673 : *
1674 : * @flags: See the enum event_command_flags below.
1675 : *
1676 : * All the methods below, except for @set_filter() and @unreg_all(),
1677 : * must be implemented.
1678 : *
1679 : * @func: The callback function responsible for parsing and
1680 : * registering the trigger written to the 'trigger' file by the
1681 : * user. It allocates the trigger instance and registers it with
1682 : * the appropriate trace event. It makes use of the other
1683 : * event_command callback functions to orchestrate this, and is
1684 : * usually implemented by the generic utility function
1685 : * @event_trigger_callback() (see trace_event_triggers.c).
1686 : *
1687 : * @reg: Adds the trigger to the list of triggers associated with the
1688 : * event, and enables the event trigger itself, after
1689 : * initializing it (via the event_trigger_ops @init() function).
1690 : * This is also where commands can use the @trigger_type value to
1691 : * make the decision as to whether or not multiple instances of
1692 : * the trigger should be allowed. This is usually implemented by
1693 : * the generic utility function @register_trigger() (see
1694 : * trace_event_triggers.c).
1695 : *
1696 : * @unreg: Removes the trigger from the list of triggers associated
1697 : * with the event, and disables the event trigger itself, after
1698 : * initializing it (via the event_trigger_ops @free() function).
1699 : * This is usually implemented by the generic utility function
1700 : * @unregister_trigger() (see trace_event_triggers.c).
1701 : *
1702 : * @unreg_all: An optional function called to remove all the triggers
1703 : * from the list of triggers associated with the event. Called
1704 : * when a trigger file is opened in truncate mode.
1705 : *
1706 : * @set_filter: An optional function called to parse and set a filter
1707 : * for the trigger. If no @set_filter() method is set for the
1708 : * event command, filters set by the user for the command will be
1709 : * ignored. This is usually implemented by the generic utility
1710 : * function @set_trigger_filter() (see trace_event_triggers.c).
1711 : *
1712 : * @get_trigger_ops: The callback function invoked to retrieve the
1713 : * event_trigger_ops implementation associated with the command.
1714 : */
1715 : struct event_command {
1716 : struct list_head list;
1717 : char *name;
1718 : enum event_trigger_type trigger_type;
1719 : int flags;
1720 : int (*func)(struct event_command *cmd_ops,
1721 : struct trace_event_file *file,
1722 : char *glob, char *cmd, char *params);
1723 : int (*reg)(char *glob,
1724 : struct event_trigger_ops *ops,
1725 : struct event_trigger_data *data,
1726 : struct trace_event_file *file);
1727 : void (*unreg)(char *glob,
1728 : struct event_trigger_ops *ops,
1729 : struct event_trigger_data *data,
1730 : struct trace_event_file *file);
1731 : void (*unreg_all)(struct trace_event_file *file);
1732 : int (*set_filter)(char *filter_str,
1733 : struct event_trigger_data *data,
1734 : struct trace_event_file *file);
1735 : struct event_trigger_ops *(*get_trigger_ops)(char *cmd, char *param);
1736 : };
1737 :
1738 : /**
1739 : * enum event_command_flags - flags for struct event_command
1740 : *
1741 : * @POST_TRIGGER: A flag that says whether or not this command needs
1742 : * to have its action delayed until after the current event has
1743 : * been closed. Some triggers need to avoid being invoked while
1744 : * an event is currently in the process of being logged, since
1745 : * the trigger may itself log data into the trace buffer. Thus
1746 : * we make sure the current event is committed before invoking
1747 : * those triggers. To do that, the trigger invocation is split
1748 : * in two - the first part checks the filter using the current
1749 : * trace record; if a command has the @post_trigger flag set, it
1750 : * sets a bit for itself in the return value, otherwise it
1751 : * directly invokes the trigger. Once all commands have been
1752 : * either invoked or set their return flag, the current record is
1753 : * either committed or discarded. At that point, if any commands
1754 : * have deferred their triggers, those commands are finally
1755 : * invoked following the close of the current event. In other
1756 : * words, if the event_trigger_ops @func() probe implementation
1757 : * itself logs to the trace buffer, this flag should be set,
1758 : * otherwise it can be left unspecified.
1759 : *
1760 : * @NEEDS_REC: A flag that says whether or not this command needs
1761 : * access to the trace record in order to perform its function,
1762 : * regardless of whether or not it has a filter associated with
1763 : * it (filters make a trigger require access to the trace record
1764 : * but are not always present).
1765 : */
1766 : enum event_command_flags {
1767 : EVENT_CMD_FL_POST_TRIGGER = 1,
1768 : EVENT_CMD_FL_NEEDS_REC = 2,
1769 : };
1770 :
1771 0 : static inline bool event_command_post_trigger(struct event_command *cmd_ops)
1772 : {
1773 0 : return cmd_ops->flags & EVENT_CMD_FL_POST_TRIGGER;
1774 : }
1775 :
1776 0 : static inline bool event_command_needs_rec(struct event_command *cmd_ops)
1777 : {
1778 0 : return cmd_ops->flags & EVENT_CMD_FL_NEEDS_REC;
1779 : }
1780 :
1781 : extern int trace_event_enable_disable(struct trace_event_file *file,
1782 : int enable, int soft_disable);
1783 : extern int tracing_alloc_snapshot(void);
1784 : extern void tracing_snapshot_cond(struct trace_array *tr, void *cond_data);
1785 : extern int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update);
1786 :
1787 : extern int tracing_snapshot_cond_disable(struct trace_array *tr);
1788 : extern void *tracing_cond_snapshot_data(struct trace_array *tr);
1789 :
1790 : extern const char *__start___trace_bprintk_fmt[];
1791 : extern const char *__stop___trace_bprintk_fmt[];
1792 :
1793 : extern const char *__start___tracepoint_str[];
1794 : extern const char *__stop___tracepoint_str[];
1795 :
1796 : void trace_printk_control(bool enabled);
1797 : void trace_printk_start_comm(void);
1798 : int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set);
1799 : int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled);
1800 :
1801 : /* Used from boot time tracer */
1802 : extern int trace_set_options(struct trace_array *tr, char *option);
1803 : extern int tracing_set_tracer(struct trace_array *tr, const char *buf);
1804 : extern ssize_t tracing_resize_ring_buffer(struct trace_array *tr,
1805 : unsigned long size, int cpu_id);
1806 : extern int tracing_set_cpumask(struct trace_array *tr,
1807 : cpumask_var_t tracing_cpumask_new);
1808 :
1809 :
1810 : #define MAX_EVENT_NAME_LEN 64
1811 :
1812 : extern ssize_t trace_parse_run_command(struct file *file,
1813 : const char __user *buffer, size_t count, loff_t *ppos,
1814 : int (*createfn)(const char *));
1815 :
1816 : extern unsigned int err_pos(char *cmd, const char *str);
1817 : extern void tracing_log_err(struct trace_array *tr,
1818 : const char *loc, const char *cmd,
1819 : const char **errs, u8 type, u8 pos);
1820 :
1821 : /*
1822 : * Normal trace_printk() and friends allocates special buffers
1823 : * to do the manipulation, as well as saves the print formats
1824 : * into sections to display. But the trace infrastructure wants
1825 : * to use these without the added overhead at the price of being
1826 : * a bit slower (used mainly for warnings, where we don't care
1827 : * about performance). The internal_trace_puts() is for such
1828 : * a purpose.
1829 : */
1830 : #define internal_trace_puts(str) __trace_puts(_THIS_IP_, str, strlen(str))
1831 :
1832 : #undef FTRACE_ENTRY
1833 : #define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \
1834 : extern struct trace_event_call \
1835 : __aligned(4) event_##call;
1836 : #undef FTRACE_ENTRY_DUP
1837 : #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \
1838 : FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
1839 : #undef FTRACE_ENTRY_PACKED
1840 : #define FTRACE_ENTRY_PACKED(call, struct_name, id, tstruct, print) \
1841 : FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
1842 :
1843 : #include "trace_entries.h"
1844 :
1845 : #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
1846 : int perf_ftrace_event_register(struct trace_event_call *call,
1847 : enum trace_reg type, void *data);
1848 : #else
1849 : #define perf_ftrace_event_register NULL
1850 : #endif
1851 :
1852 : #ifdef CONFIG_FTRACE_SYSCALLS
1853 : void init_ftrace_syscalls(void);
1854 : const char *get_syscall_name(int syscall);
1855 : #else
1856 1 : static inline void init_ftrace_syscalls(void) { }
1857 : static inline const char *get_syscall_name(int syscall)
1858 : {
1859 : return NULL;
1860 : }
1861 : #endif
1862 :
1863 : #ifdef CONFIG_EVENT_TRACING
1864 : void trace_event_init(void);
1865 : void trace_event_eval_update(struct trace_eval_map **map, int len);
1866 : /* Used from boot time tracer */
1867 : extern int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set);
1868 : extern int trigger_process_regex(struct trace_event_file *file, char *buff);
1869 : #else
1870 : static inline void __init trace_event_init(void) { }
1871 : static inline void trace_event_eval_update(struct trace_eval_map **map, int len) { }
1872 : #endif
1873 :
1874 : #ifdef CONFIG_TRACER_SNAPSHOT
1875 : void tracing_snapshot_instance(struct trace_array *tr);
1876 : int tracing_alloc_snapshot_instance(struct trace_array *tr);
1877 : #else
1878 : static inline void tracing_snapshot_instance(struct trace_array *tr) { }
1879 : static inline int tracing_alloc_snapshot_instance(struct trace_array *tr)
1880 : {
1881 : return 0;
1882 : }
1883 : #endif
1884 :
1885 : #ifdef CONFIG_PREEMPT_TRACER
1886 : void tracer_preempt_on(unsigned long a0, unsigned long a1);
1887 : void tracer_preempt_off(unsigned long a0, unsigned long a1);
1888 : #else
1889 : static inline void tracer_preempt_on(unsigned long a0, unsigned long a1) { }
1890 : static inline void tracer_preempt_off(unsigned long a0, unsigned long a1) { }
1891 : #endif
1892 : #ifdef CONFIG_IRQSOFF_TRACER
1893 : void tracer_hardirqs_on(unsigned long a0, unsigned long a1);
1894 : void tracer_hardirqs_off(unsigned long a0, unsigned long a1);
1895 : #else
1896 12938081 : static inline void tracer_hardirqs_on(unsigned long a0, unsigned long a1) { }
1897 12904352 : static inline void tracer_hardirqs_off(unsigned long a0, unsigned long a1) { }
1898 : #endif
1899 :
1900 : extern struct trace_iterator *tracepoint_print_iter;
1901 :
1902 : /*
1903 : * Reset the state of the trace_iterator so that it can read consumed data.
1904 : * Normally, the trace_iterator is used for reading the data when it is not
1905 : * consumed, and must retain state.
1906 : */
1907 0 : static __always_inline void trace_iterator_reset(struct trace_iterator *iter)
1908 : {
1909 0 : const size_t offset = offsetof(struct trace_iterator, seq);
1910 :
1911 : /*
1912 : * Keep gcc from complaining about overwriting more than just one
1913 : * member in the structure.
1914 : */
1915 0 : memset((char *)iter + offset, 0, sizeof(struct trace_iterator) - offset);
1916 :
1917 0 : iter->pos = -1;
1918 : }
1919 :
1920 : /* Check the name is good for event/group/fields */
1921 : static inline bool is_good_name(const char *name)
1922 : {
1923 : if (!isalpha(*name) && *name != '_')
1924 : return false;
1925 : while (*++name != '\0') {
1926 : if (!isalpha(*name) && !isdigit(*name) && *name != '_')
1927 : return false;
1928 : }
1929 : return true;
1930 : }
1931 :
1932 : #endif /* _LINUX_KERNEL_TRACE_H */
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